Spring-jack.



C. H. VANDERHOOF. 1'

SPRING JACK.

APPLICATION men DEC. 6, 1913.

1,145,338. Pat entedJuly 6,1915.

. I gvvvew loz C harks H Varideriwaf COLUMBIA PLANOGRAPB CO.,WASHINGTON, D. C.

and the lower plate 2, one of which has a CHARLES H. vnnnnnrroor, o'i vonxj'nyx. f

SPRING-anon;

1 "Application filed December 6, 1913, fiserial No. 805,022. I

To all whom it may concern I Be it known that I, CHARLES H. vANDER Hoor, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented new and useful Improvements'in Spring- Jacks, ofwhich the following is a specification.

My invention relates to spring-jacks or cut-ins for telegraph keys.

The object of my invention is to produce a spring jack adapted to be attached'to the post of a telegraph key or to the main-line post of a telegraph relay and adapted to receive and retain by spring pressure the plug attached to the cord of a sending key and complete the circuit therewith.

A further object thereof is to produce a jack of said character comprisinga pair of metal plates properly insulated from each other and secured to each other one of which is adapted to be attached to the main line wire while the other plate may be conveniently attached to and connected electrically with the sending key or relay post, each of said plates having projecting extensions curved toward each other to form contacting spring lips between which the plug of the cord attached to the sending key may be inserted, and a still further object of my invention is to provide a more simple, cheap and efficient article of said class than has heretofore been attained.

To these ends, my invention includesthe combination and arrangement of component parts to be hereinafter described and more particularly pointed out in the claim.

In the accompanying drawings, in which like reference characters indicate similar parts, Figure 1 is a perspective view of my invention attached to the post of a telegraph relay and with the plug attached to the cord of a sending key inserted; Fig. 2 is a longitudinal sectional view of my. jack, and Fig. 3 is a perspective view of the parts thereof separated.

My inventioncomprises the upper plate 1 compound curved extension and theflother has a substantially straight extension, the ends of which are flared,-forming the contacting lips 3 and 4. Said plates are of brass or other spring metal constituting efficient conductors of'electricity, riveted or otherwise fastened together at a intermediate their ends, and are insulated from each Specification of Letters Jfiatent.

Patented July 6,'191 5 other by a layer or. guttapercha, fiber or other nch-conducting material. To render such insulation complete, the upper plate 1 is provided with orifices Z) of larger diameter than the rivets, which are filled7with insulating materialthrough which the rivets pass to avoid contact with that plate. I

The structure of my jack may be rein forced bya cap. or washer 5 throughwhich the rivets pass, and which is or other non-conducting material 6.

As shown in the drawings, the top plate 1 has a longitudinal extension 7 in the opposite direction from the curved lip 3, the end of which is bifurcated by providing the semi circular U-shaped cut-out portion 8,

by which said plate may embrace the post .I 1 Y.

of atelegraph key or the main-line post of a telegraph relay.

For the purpose of attaching and electrically connecting my jack with the main line wire of a telegraph circuit, I provide a screw 9 threaded into an orifice 10 in the lower plate 2 on which is carried a washer 11.

In use, myfljack may be connected with the main line wire by attaching to the lower platewhile the upper plate is connected with the post of a telegraph key or to the main-line post of a telegraph relay. The

insulatedfrom the top plate 1 by the layer of gutta percha springlips of the upper and lower plates through between the lips and the circuit connections on the jack. While thus connected, the plug connecting a sending key may be readily inserted between the lips of the upper and lower plates, and readily disconnected therefrom without at any time breaking the circuit.

Having thus described my invention, what I claim as new, and desire to be secured by Letters Patent, is

, A spring jack, comprising an upper and a lower plate of spring metal, insulating material between same, and means for fasbeing in contact, the circuit is completed such points while being insulated 7 so I tening said plates and insulating material together, a longitudinal extension on each plategprojecting beyond the interposed insua lating materialnorma'lly in contact with each other adjacent to :theirouter' ends to complete the electrical circuit, said plates having fiaringlips at their ends adapted to contact with both electrical points of'a plug before the contacting faces of the plates lie when same is inserted between the plates Copies of this patent may be obtained for five cents each,

a telegraph instrument or relay, and Wire attaching means on the lower plate, substanl0 tially as described.

CHARLES H. VANDERHOOF.

Witnesses:

W. MERICAN,

M. HoLLINGsWoR'rH.

by addressing the Commissioner of Patents,

Washington, D. C. 

